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ACT111AUS-T Datasheet(PDF) 1 Page - Active-Semi, Inc |
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ACT111AUS-T Datasheet(HTML) 1 Page - Active-Semi, Inc |
1 / 12 page Innovative PowerTM - 1 - www.active-semi.com Copyright © 2012 Active-Semi, Inc. TYPICAL APPLICATION CIRCUIT ACT111A 4.8V to 30V Input, 1.5A LED Driver with Dimming Control FEATURES • Up to 92% Efficiency • Wide 4.8V to 30V Input Voltage Range • 100mV Low Feedback Voltage • 1.5A High Output Capacity • PWM Dimming • 10kHz Maximum Dimming Frequency • Thermal Shutdown • SOT23-6 Package APPLICATIONS • High Brightness LED Driver • Architecture Detail Lighting • Constant Current Source • Hand-held Lighting • Automotive RCL, DRL, and Fog Lights • Indicators and Emergency Lighting • MR16 and other LED Bulb GENERAL DESCRIPTION The ACT111A is a high efficient LED driver employing current-mode buck converter topology that supplies up to 1.5A from wide input voltage range from 4.8V up to 30V. The ACT111A is designed to operate as a constant source with 1.4MHz fixed frequency. ACT111A consists of a PWM control circuit, a high precision band-gap voltage reference, an oscillator, an error amplifier with internal compensation network and the N channel power MOSFET. An external sense resistor in series with the LED monitors output current allowing accurate current regulation, ideal for driving high current LEDs. The built-in fault condition protection circuits including current limiting, UVLO and thermal shutdown prevent itself from potentially faulty operation and burn-out. The ACT111A is ideal for single 1W to 5W LED drivers. With its ultra low feedback voltage, a low current ripple, high efficiency of up to 92% step- down power LED driver can be easily composed of with additional several external components such as an inductor, a Schottky diode, a few resistors and capacitors. Rev 2, 22-Oct-12 |
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